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The FreeType project is a team of volunteers who develop free, portable and high-quality software solutions for digital typography. They specifically target embedded systems and focus on providing small, efficient and ubiquitous products.

This package provides a client interface to the X Window System, otherwise known as 'Xlib'. It provides a complete API for the basic functions of the window system.

A free cross-platform library of fast C++ routines for plotting data in up to 3 dimensions. It can export plots to bitmaps and vector EPS, SVG, IDTF files. There are simple window interfaces based on GLUT, FLTK and/or Qt. MathGL can also be used in the console. There are interfaces to a set of languages, such as, C, Fortran, Pascal, Forth, Python, Octave.

These packages are either mandated by the core LaTeX team, or very widely used and strongly recommended in practice.

Uim is an input method module library which supports various scripts and can act as a front end for a range of input methods, including Anthy, Canna, or SKK (for Japanese), Pinyin (for Chinese), Byeoru (for Korean), and M17n (for many other languages). Most of its functions are implemented in Scheme, so it's very simple and flexible.